JP2000318299A - Ink jet recording medium and method for recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording medium for correctly proofreading a color print of a sheet having low whiteness such as a weekly magazine, a magazine, a newspaper or the like. SOLUTION: In the ink jet recording medium having an ink receiving layer provided on a support, the receiving layer contains a pigment, an adhesive and a coloring agent, a lightness index L* according to JIS Z 8730 of the surface of 80 to 85, and color coordinates a* of -0.3 to 0, and b* of 3.0 to 9.3. In this case, as the coloring agent, a cationic dye, a direct dye or a pigment dye is used. Smoothness (Oken type smoothness) according to JAPAN TAPPI No.5 of a surface of the receiving layer is 5 to 100 sec.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is excellent in ink absorbency and image reproducibility, and is also provided with a function as a color proofing paper for paper containing waste paper (weekly magazines, magazines, newspapers, etc.) having low whiteness. To an inkjet recording medium.

[0002]

2. Description of the Related Art Low whiteness paper such as weekly magazines, magazines, newspapers, etc.
(Including used paper), when printing in color,
There was a problem that the color tone of the printed image was shifted due to the effect of the color of the paper itself. In order to adjust the deviation of the color tone, printing is performed on a trial basis, the deviation of the color tone of the image is adjusted, and then the actual printing is performed.

[0003] The proofreading of color pages of a publication is requested by performing test printing, collating with a manuscript, correcting errors and improper points, and examining the color of printed matter and the effect of color printing. This is a process to check whether the quality is met. However, if calibration is performed using an actual printing press, a large amount of printing ink and printing paper are consumed, and a long time is required.
For this reason, it is conceivable to adjust the color tone in advance by using a simple printer, and there is an inkjet recording type printer as such a printer.

[0004] The ink jet recording system has been used in various applications as a recording apparatus for various figures and characters including characters because of low noise at the time of recording, easy colorization, and high speed recording. Spreading rapidly. Further, it is possible to obtain an image formed by the multi-color ink jet system, which is comparable to the printing by the plate making system and the color photographic system.

[0005] When an ink jet printer is used for proofreading color pages of a publication, if ordinary high-quality paper or coated paper is used as a recording medium, these papers have a small ink absorption capacity. Overflow, color mixing occurs, and color images cannot be recorded.

[0006] In addition, calibration is performed using generally available ink-jet paper having a high whiteness, and the color tone of the printed matter is adjusted.
When the printing effect is optimally adjusted, there is a problem that when offset printing is actually performed on a low whiteness paper such as a newspaper, the color tone of the printed matter and the quality of the printing effect are different, and the color tone is not as intended.

[0007] The incorporation of a colorant into the ink receiving layer of an ink jet recording medium is described in, for example, JP-A-8-207422. However, this discloses that background coloring such as yellow or red is performed to enhance visibility or decorativeness. In a recording medium in which coloring is clearly recognized, the color tone is remarkably increased. It cannot be used for calibration at all because it changes. In addition, JP 10
JP-A-235993 and JP-A-10-297080 also color the background for decorativeness and visibility, and cannot be used for calibration at all. Also, in JP-A-7-314880, a colorant is contained in the ink receiving layer, but the colorant in the receiving layer reacts with the dye in the ink for inkjet recording to obtain a recorded image with less bleeding. In this case, for example, the receiving layer is colored yellow as the optical density in the visible light region exceeds 1, and a clear recording is obtained with blue ink. This is a recording medium that cannot be used for calibration at all.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a method for color printing of low whiteness paper (including used paper) including mechanical pulp, such as weekly magazines, magazines and newspapers. An object of the present invention is to provide an ink jet recording medium capable of correctly performing calibration.

[0009]

As a result of repeated studies, the present inventors have found that a colorant is contained in the ink receiving layer so that the ink receiving layer has a color tone similar to that of waste paper containing low whiteness and the like. It has been found that by using an ink jet recording medium with adjusted smoothness, it is possible to calibrate a color page of a sheet having a low whiteness degree including mechanical pulp in a short time, with a simple operation, and accurately. Further, more accurate calibration can be performed by adjusting the optical reflection density and the ISO whiteness to specific ranges.

The present invention includes the following aspects. [1] In an ink jet recording medium having an ink receiving layer provided on a support, the ink receiving layer contains a pigment, an adhesive, and a colorant, and the surface has a brightness index L * according to JIS Z8730.
Is 80 or more and 85 or less, and the color coordinates a * are -3.0 or more and 0 or less, and b * is 3.0 or more and 9.3 or less. [2] The ink jet recording medium according to [1], wherein the colorant is a cationic dye, a direct dye or a pigment dye. [3] The smoothness (Oken type smoothness) of the ink receiving layer surface according to JAPAN TAPPI No. 5 is 5 seconds or more and 100 seconds or less [1]
Or the inkjet recording medium according to [2]. [4] The inkjet recording medium according to [3], wherein the smoothness of the ink receiving layer surface according to JAPAN TAPPI No. 5 (Oken type smoothness) is 5 seconds or more and 50 seconds or less. [5] An ink jet recording method using the ink jet recording medium according to [1], [2], [3] or [4] as a color tone proofing paper for performing multicolor printing on paper containing mechanical pulp. An ink jet recording method for preliminarily recording an image to be subjected to the multicolor printing on the ink jet recording medium by an ink jet recording method and obtaining information for correcting a color tone deviation from the obtained recording.

[6] The optical reflection density on the surface of the ink receiving layer is
[1], [2], [3] or [4] not less than 0.15 and not more than 0.25
The inkjet recording medium according to any one of the preceding claims. [7] The inkjet recording medium according to [1], [2], [3], [4] or [6], wherein the surface of the ink receiving layer has an ISO whiteness of 45 or more and 60 or less.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a colorant is contained in an ink receiving layer, and the surface of the ink receiving layer is represented by a lightness index L * measured by the method described in JIS Z8730, and color coordinates a * and b *. , L * is 80 or more and 85 or less, and a * is -3.0 or more and 0
Hereinafter, adjustment is made so that b * satisfies the condition of 3.0 or more and 9.3 or less. Preferably, L * is 81 or more and 84 or less, and a
* Is -2.0 or more and -1.0 or less, and b * is 4.0 or more and 7.5 or less.

As the colorant, both a dye colorant and a pigment colorant can be used. As the colorant to be added, various types of dyes such as cationic dyes, direct dyes, acid dyes, basic dyes, and reactive dyes can be used as dye-based colorants, but cationic dyes and direct dyes are preferred. Cationic dyes are generally water-soluble, forming a salt consisting of the cation part of the dye body having an onium group and a counter anion such as chloride and sulfate, and are methine dyes, azomethine dyes, azo dyes, and triphenylmethane. Various types of dyes such as dyes based on dyes and anthraquinone dyes can be exemplified. Examples of the direct dye include a polyazo dye, a diallyl urea derivative, a cyanuric chloride derivative, a stilbene derivative, a thiazole derivative, and a metal complex salt type. Examples of the pigment colorant include various types such as azo dyes, insoluble azo pigments, azo lake pigments, phthalocyanine pigments, vat dye pigments, quinacridone pigments, and dioxazine pigments. These colorants can be used alone or in combination of two or more. The addition amount of these coloring agents is not particularly limited,
The lightness index L * and the color coordinates are amounts to be adjusted to the specific range.

The ink receiving layer contains a pigment and an adhesive.
The pigment preferably contains a pigment that is porous, has high ink absorbency, and enables clear color development. Examples of such pigments include synthetic silica, zeolite, calcium carbonate, calcium silicate, aluminum hydroxide, calcined clay, kaolin, clay, talc, white carbon, organic pigments (plastic pigment), and the like, and are generally used for paper coating. Examples of such pigments include, but it is particularly preferable to use synthetic silica. The pigment particle size is about 0.5 to 20 μm.

The proportion of the pigment used is not limited, but is about 50 to 90% by weight of the solid content of the receiving layer. If it is less than 50%, the ink absorbency becomes insufficient, and if it exceeds 90%, the strength of the ink receiving layer may be reduced.

The adhesive used in the ink receiving layer of the present invention includes polyvinyl alcohol, polyvinyl alcohol derivatives such as cationic polyvinyl alcohol and silyl-modified polyvinyl alcohol, polyvinylpyrrolidone, and the like.
Proteins such as casein, starch and derivatives thereof, styrene butadiene copolymers, conjugated diene-based polymer latexes such as methyl methacrylate-butadiene copolymers, and acrylics such as polymers or copolymers of acrylates and methacrylates -Based polymer latex, ethylene-vinyl acetate copolymer, vinyl-based polymer latex such as ethylene-vinyl chloride copolymer, or carboxyl group of these various polymers, functional group-containing modified polymer latex such as cationic group, Synthetic resin-based aqueous adhesives such as melamine resin and urea resin, maleic anhydride copolymer resin, polyacrylamide, polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, polyvinyl butyral, alkyd resin, etc. Polymers such as synthetic resin adhesives Charges or good adhesion to the substrate, and since a good affinity with the water-based ink, so improving the absorbent, is preferably used.

The use ratio of the adhesive in the ink receiving layer is not limited, but is about 10 to 50% by weight, preferably 10 to 40% by weight of the solid content of the receiving layer. If it is less than 10%, the adhesive strength becomes insufficient, and there is a concern that the strength of the receiving layer may be reduced. On the other hand, if it exceeds 50%, the adhesive strength increases, but the use ratio of the pigment decreases, and as described above, a problem may occur in the ink absorbency.

In order to improve the water resistance of a printed image with an aqueous ink, a polydiallyldimethylammonium resin, a polyethyleneimine resin, a polyamine resin,
Cationic polymer compounds such as polyamide resins, polyamide epichlorohydrin resins, polyamine epichlorohydrin resins, polyamide polyamine epichlorohydrin resins, polydiallylamine resins, and dicyandiamide condensates can be suitably used.

If necessary, a pigment dispersant, a thickener,
Antifoaming agents, foam inhibitors, foaming agents, mold release agents, penetrants, wetting agents, thermal gelling agents, lubricants, and various other auxiliaries known in the art can be used.

The ink receiving layer of the ink jet recording medium of the present invention has JAPAN TAPPI No. 5 (Oken type smoothness) of 5 to 100.
Seconds are preferred. If the smoothness is less than 5 seconds, the surface is rough and there is an ink jet recorded image, and if the smoothness is more than 100 seconds, the recorded image shines, and both the color effect when printing on low whiteness printing paper, newsprint etc. It is not preferable because it is different from The smoothness of the ink receiving layer is adjusted by using a calender such as a machine calender or a super calender after coating and drying the pigment particle size in the receiving layer and the receiving layer.

In the present invention, the ink jet recording medium obtained as described above is used as a color tone proofing sheet for performing multicolor printing on paper containing mechanical pulp. Is recorded in advance on the ink jet recording medium by the ink jet recording method, it is checked whether or not there is a color shift, and data for adjusting the amount of each color ink for calibrating the color shift is obtained. This is for printing.

In the present invention, as a printing paper for finally obtaining a calibrated multicolor print image, a paper of a grade having low whiteness is targeted. Examples of such papers include those used for weekly magazines, magazines, newspapers, and the like (including those containing waste paper). These are low whiteness papers,
The present invention particularly relates to mechanical pulp (also called groundwood pulp GP).
The present invention is most suitable for proofreading when printing paper including RGP (including RGP), and particularly suitable for proofreading color printing of newspapers.

[0023]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Further, “parts” and “%” shown in the examples are solid content parts by weight and solid content weight%, respectively, unless otherwise specified.
Is shown. Example 1 The support had a basis weight of 72 g / m ² , L * = 94.6, a * = − 0.52, b * = 3.30, IS
O White paper = 83.0 high quality paper was used. The ink receiving layer was applied on the surface of the support. The coating liquid for the ink receiving layer is silanol-modified polyvinyl alcohol (R-1
130, 30 parts of Kuraray Co., Ltd.) is added to 400 parts of water, and stirred while heating to 90 ° C. to dissolve the silanol-modified polyvinyl alcohol. To this solution, 100 parts of amorphous synthetic silica (Carplex # 80, Shionogi & Co., 9.3 μm), 10 parts of vinyl acetate-ethylene latex (Sumikaflex S-470, Sumitomo Chemical) and polydiallyldimethylammonium Chloride (Unisense CP-103, Senka Co., Ltd.) 10 parts and direct cationic dye (Kayacell Black CN Liquid, Nippon Kayaku, 1.65 parts liquid weight of commercial product), direct cationic dye
(Kayacell Yellow CG Liquid, Nippon Kayaku, 1.2 parts, liquid weight of commercial product), direct cationic dye (Kayacell Red CB Liquid, Nippon Kayaku, parts are shown by liquid weight of commercial product. Unless otherwise specified, liquid-attached dyes are shown in terms of liquid parts by weight of a commercially available product.) 0.15 parts were mixed and stirred. The dry coating amount to fine paper coating liquid basis weight 72 g / m ² is 10 g / m ²
It was applied with a bar coater so as to be dried at 110 ° C. Further, the ink jet recording medium was processed at a super calender linear pressure of 20 kg / cm to prepare an ink jet recording medium.

Example 2 The dye composition of Example 1 was prepared using 2.20 parts of a direct cationic dye (Kayacel Black CN Liquid, Nippon Kayaku), and a direct cationic dye.
(Kayacell Yellow CG Liquid, Nippon Kayaku) 1.6 parts, direct cationic dye (Kayacel Red CB Liquid, Nippon Kayaku) 0.2
An ink jet recording medium was prepared in the same manner as in Example 1 except that the amount was changed to 0.

Example 3 The dye composition of Example 1 was prepared using 1.60 parts of a direct cationic dye (Kayacell Black CN Liquid, Nippon Kayaku), 1.50 parts of a direct dye (Kayafect Yellow Y Liquid, Nippon Kayaku),
(Kayafect Red B Liquid, Nippon Kayaku) An ink jet recording medium was prepared in the same manner as in Example 1, except that the amount was changed to 0.40 part. Example 4 The dye composition of Example 1, a black pigment dye (TB530 Black TB,
An ink jet recording medium was prepared in the same manner as in Example 1 except that 0.70 parts of Dainichisei) and 0.15 parts of a yellow pigment dye (TB500 Yellow R, Dainichisei) were used.

Example 5 An ink jet recording medium was prepared in the same manner as in Example 3 except that the linear pressure of the supercalender of Example 4 was changed to 45 kg / cm. Example 6 The dye composition of Example 1, a black pigment dye (TB530 Black TB,
An ink jet recording medium was produced in the same manner as in Example 1, except that 0.80 parts of Dainichisei) and 0.20 parts of a yellow pigment dye (TB500 Yellow R, Dainichisei) were used.

Example 7 In Example 1, the dye composition was changed to a black pigment dye (TB53).
Ink jet return page media were prepared in the same manner as in Example 1 except that 0.85 parts of 0 black TB (Dainichisei) and 0.15 part of yellow pigment dye (TB500 Yellow R, Dainichisei) were used. Example 8 The dye composition of Example 1 was prepared using a black pigment dye (TB530 Black TB,
An ink jet recording medium was prepared in the same manner as in Example 1, except that 0.50 parts of Dainichisei) and 0.15 parts of a yellow pigment dye (TB500 Yellow R, Dainichisei) were used. Example 9 Amorphous synthetic silica (Carplex # 80, Shionogi & Co., particle size: 6.8 μm) of Example 1 was replaced with amorphous synthetic silica (Sylysia 470,
Fuji Silysia Chemical, particle size 12μm), black pigment dye (TB530 Black TB, Dainichi Seika) 0.70 parts, yellow pigment dye
(TB500 Yellow R, Dainichi Seika) Examples except for 0.15 parts
An ink jet recording medium was prepared in the same manner as in 1.

Example 10 The dye composition of Example 1 was changed to a black pigment dye (TB530 Black TB,
(Nippon Seika) 0.70 parts, yellow pigment dye (TB500 Yellow R, Dainichi Seika) 0.15 parts, except that the linear pressure of the super calender was 135Kg / cm, in the same manner as in Example 1 to prepare an ink jet recording medium .

Comparative Example 1 An ink jet recording medium was prepared in the same manner as in Example 1 except that the dye addition ratio in Example 1 was reduced to zero. Comparative Example 2 The dye composition of Example 1, a direct cationic dye (Kayacel Black CN Liquid, Nippon Kayaku) 1.10 parts, direct cationic dye (Kayacel Yellow CG Liquid, Nippon Kayaku) 0.80 parts, direct cation Dye (Kayacel Red CB Liquid, Nippon Kayaku)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the amount was changed to 0.30 part.

Comparative Example 3 The dye composition of Example 1 was prepared using 0.80 part of a direct cationic dye (Kayacel Black CN Liquid, Nippon Kayaku), 0.60 part of a direct cationic dye (Kayacell Yellow CG Liquid, Nippon Kayaku), Direct cationic dye (Kayacel Red CB Liquid, Nippon Kayaku)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the amount was changed to 0.14 part.

Comparative Example 4 The dye composition of Example 1 was composed of 1.65 parts of a direct cationic dye (Kayacel Black CN Liquid, Nippon Kayaku), 1.80 parts of a direct cationic dye (Kayacel Yellow CG Liquid, Nippon Kayaku), Direct cationic dye (Kayacel Red CB Liquid, Nippon Kayaku)
An ink jet recording medium was prepared in the same manner as in Example 1, except that the amount was changed to 0.10 part. Comparative Example 5 The dye composition of Example 1, direct cationic dye (Kayacel Black CN Liquid, Nippon Kayaku) 1.10 parts, direct cationic dye (Kayacel Yellow CG Liquid, Nippon Kayaku) 0.80 parts, direct cationic Dye (Kayacel Red CB Liquid, Nippon Kayaku)
An ink jet recording medium was prepared in the same manner as in Example 1 except that the amount was changed to 0.50 parts.

The evaluation of Examples 1 to 10 and Comparative Examples 1 to 5 was carried out by the following methods, and the results are shown in Table 1. [Lightness Index L * and Color Coordinates] The lightness index L * and color coordinates a * and b * in the present invention were measured on the surface of the ink receiving layer by the method described in JIS Z8730.

[Oken Type Smoothness] The smoothness in the present invention is
JAPAN Tappi No. 5. The surface of the ink receiving layer was measured by a method based on B-Oken type smoothness (pressure type). [ISO Whiteness] In the present invention, the ISO whiteness is measured on the surface of the ink receiving layer by the method described in ISO3688.

[Color Tone] The tone of the newspaper was low-white newspaper paper (L * = 80.5, a * = − 0.98, b * = 6.3, ISO whiteness = 5).
2.2, including GP) and inkjet recording media,
◎ indicates that the color tone is the same as visually determined, Δ indicates that the color tone is substantially the same, Δ indicates that the color tone is shifted, and X indicates that the color tone is significantly different.

[Evaluation of proof paper] The color proof paper was evaluated by using an ink jet plotter (Design Jet 2500cp: Hewlett-Packard Co.), using UV ink (Hewlett-Packard Co., Ltd. pigment ink). An image sample N1 (portrait) of the issued high-definition color digital standard image data (ISO / JIS-SCID) was printed, and the image was visually observed to confirm a color tone shift. Based on this image, newsprint was printed by an actual printing press. Good proof paper was evaluated as ◎, substantially good color tone was obtained as ○, slight color tone was deviated as Δ, and print color obtained was deviated as ×.

[Printing Density] Printing was performed using the above-mentioned ink jet plotter and UV ink, and the optical density of the 100% black printed portion was measured using a Macbeth densitometer (Macbeth RD-914).
Is the optical reflection density measured without passing through a color filter, and the surface of the ink receiving layer was measured. In addition, Example 9 having a smoothness of 3 seconds has a slightly rough feeling,
Further, Example 10 having a smoothness of 120 seconds was too smooth, giving an impression different in texture, hand and the like from paper containing mechanical pulp such as newsprint.

[0037]

[Table 1]

[0038]

The present invention has excellent ink absorbency and image reproducibility, and also has a function as a color proofing paper for used paper (weekly magazines, magazines, newspapers, etc.) having low whiteness. It was an inkjet recording medium. An ink jet recording medium of the present invention is used to obtain a record with an ink jet printer in advance, observe a color tone shift, obtain data for adjusting the color tone, and then perform actual printing to obtain an excellent color tone shift. Printing was obtained. In particular, it was suitable for proofreading of color printing of newspaper.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2C056 EA04 FC06 2H086 BA04 BA15 BA21 BA33 BA34 BA41 BA44

Claims (5)

[Claims] 1. In an ink jet recording medium having an ink receiving layer provided on a support, said ink receiving layer contains a pigment, an adhesive and a colorant, and the surface has a lightness index L * according to JIS Z8730 of 80 to 85. And the color coordinate a * is −3.0.
An ink jet recording medium, characterized in that b is not less than 0 and b * is not less than 3.0 and not more than 9.3. 2. The ink jet recording medium according to claim 1, wherein the colorant is a cationic dye, a direct dye or a pigment dye. 3. The ink jet recording medium according to claim 1, wherein the smoothness of the surface of the ink receiving layer according to JAPAN TAPPI No. 5 (Oken type smoothness) is 5 seconds or more and 100 seconds or less. 4. The ink jet recording medium according to claim 3, wherein the smoothness of the surface of the ink receiving layer according to JAPAN TAPPI No. 5 (Oken type smoothness) is 5 seconds or more and 50 seconds or less. 5. An ink-jet recording method using the ink-jet recording medium according to claim 1, 2, or 3 as a color tone calibration sheet for performing multi-color printing on paper containing mechanical pulp. An ink jet recording method in which an image to be printed is previously recorded on the ink jet recording medium by an ink jet recording method, and information for correcting a color tone deviation is obtained from the obtained recording.